Program, System and Method for Authenticating Permission to Use a Computer System and Inhibiting Access to an Unauthorized User

1. A computer readable recording medium storing an authenticating program controlling a computer to function as: input supervising means that supervises input manipulation of a computer while a user is logged in the computer; input information acquiring means that acquires input information related to an input manipulation detected by the input supervising means, the input information including a manipulation object identifying an object of the input manipulation, a manipulation class identifying a process executed for the manipulation object, and a manipulation characteristic identifying a manner in which the process is executed; characteristic information storing means that stores characteristic information including stored manipulation objects, stored manipulation classes identifying processes executed for the stored manipulation objects, stored manipulation characteristics identifying manners of executing the processes, and characteristic frequencies, each characteristic frequency corresponding to one of the stored manipulation objects, with a corresponding manipulation class, and a corresponding stored manipulation characteristic; frequency acquiring means that sorts the input information into groups of input manipulations having the same manipulation object and the same manipulation class, and acquires a frequency of appearance of a manipulation characteristic in a group based on the sorted input information corresponding to input manipulations of the group; frequency based comparing means that acquires a characteristic frequency corresponding to the same manipulation characteristic as the manipulation characteristic in the group, from the characteristic information, and compares the characteristic frequency with the frequency of appearance; frequency based authenticating means that decides whether the frequency of appearance is larger than the characteristic frequency based on a result of comparing; and frequency based control means that switches the computer in a locked operating state in which the user is prevented from using the computer, if the frequency based authenticating means has decided that the frequency of appearance is larger than the characteristic frequency.

2. An authenticating system, comprising: an input supervising unit that supervises input manipulations of a computer while a user is logged in the computer; an input information acquiring unit that acquires input information for each of the input manipulation detected by the input supervising unit, the input information including a manipulation object of the input manipulation, a manipulation class indentifying a process executed on the input object, and a manipulation characteristic identifying the manner in which the process is executed; a characteristic information storing unit that stores characteristic information including stored manipulation objects, stored manipulation classes identifying processes executed for the stored manipulation objects, stored manipulation characteristics identifying manners of executing the processes, and characteristic frequencies, each characteristic frequency corresponding to one of the stored manipulation objects, with a corresponding manipulation class, and a corresponding stored manipulation characteristic; a frequency acquiring unit that sorts the input information into groups of input manipulation having the same manipulation object and the same manipulation class, and acquires a frequency of appearance of a manipulation characteristic in a group based on the sorted input information corresponding to input manipulation of the group; a frequency based comparing unit that acquires a characteristic frequency corresponding to the same manipulation characteristic as the manipulation characteristic in the group, from the characteristic information, and compares the characteristic frequency with the frequency of appearance; a frequency based authenticating unit that decides whether the frequency of appearance is larger than the characteristic frequency based on a result of comparing; and a frequency based control unit that switches the computer in a locked operating state which prevents a user from using the computer, if the frequency based authenticating unit has decided that the frequency of appearance is larger than the characteristic frequency.

3. A method for authenticating permission of a user to use a computer by a processor, comprising: causing the processor to supervise input manipulations of a computer while a user is logged in the computer; casing the processor to acquire input information for each of the input manipulation detected by the input supervising unit, for each input manipulation, the input information including a manipulation object of the input manipulation, a manipulation class indentifying a process executed on the input object, and a manipulation characteristic identifying the manner in which the process is executed; causing the processor to sort the input information into groups of input manipulation having the same manipulation object and the same manipulation class; causing the processor to acquire a frequency of appearance of a manipulation characteristic in a group based on the sorted input information corresponding to input manipulation of the group; causing the processor to retrieve a characteristic frequency for the manipulation characteristic, the manipulation class of the group, and the manipulation object of the group, from stored characteristic information including stored manipulation objects, stored manipulation classes identifying processes executed for the stored manipulation objects, stored manipulation characteristics identifying manners of executing the processes, and characteristic frequencies, each characteristic frequency corresponding to one of the stored manipulation objects, with a corresponding manipulation class, and a corresponding stored manipulation characteristic; causing the processor to compare the frequency of appearance with the retrieved characteristic frequency; causing the processor to switch the computer in a lock state in which the user is prevented from using the computer, when the frequency of appearance is larger with respect to the retrieved characteristic frequency.